I use very small treble hooks for inland trout and panfish. number 18 and number 20.
The number 20's are very fragile, and I have broke the treble hook while using a hook out, number 18 hooks are better.
For Walleye, I usually use #12 to #14 trebles, pike are usually #4 to #6 unless I am really using a very large bait.
The thing that I like about using small trebles is that you can usually put the hooks in the minnow without killing it. This helps for trout and walleye. Pike don't seem to care.
I use pre-tied leaders that have a small loop in them. all of my tip ups have a small snap which I can then put through the loop on the leader. I can use any size and length of leader on any style tip up that I own.
Trout / Walleye leaders are usually #8 florocarbon for pike I usually use a super braid in #20 to #30 lb test.
Hope this helps,
Wiener